On 26/07/12 18:24, Bill Unruh wrote:
> On Thu, 26 Jul 2012, Torquil Macdonald S�rensen wrote:
>
>> Hi!
>>
>> I'm having a problem with my microphone inputs, and the master volume doesn't
>> seem to be a master volume. In more detail:
>>
>> Part A of problem (microphone bleed):
>>
>> 1) In my headphones, I can hear the signal picked up by the laptop "Internal
>> Mic" if "Internal Mic Boost" is maximised, even though "Internal mic" is
>> minimised. It can also be heard out of the speakers when not using headphones,
>> but for now I'm only using headphones.
>
> What is the problem? Remember that mic level usually does not go from 0 fbut
> from some minimum to a max. Ie, the slider all the way down will correspond to
> -30dB or something. If you then have mic boost as well, well it will be
> audible.
Sure, I have some experience with conventional audio equipment, e.g. analogue
multi-channel mixers and so on used in professional audio. -30dB is not nearly
enough suppression at the fader minimum position (if that is what ALSA uses),
and apparently it is not really a hardware limitation, since I don't have the
same trouble on Windows 7 (I'm dual booting). Or perhaps Windows provides
additional attenuation in software somehow?
The problem is that I think it should be enough to minimise only one fader, not
two, in order to get rid of any playback of signals picked up by the internal
mic (or external mic for that matter). If I'm working with a weak input signal
that requires a maximised mic boost, and simultaneously monitoring it, I need to
minimise both the monitoring and boost levels to get rid of the microphone
sounds in my headphones. It should be enough to reduce one fader, the monitoring
level.
>
> Secondly, there are two controls. One is for the "monitoring" and one is for
> the volume going to the recording input. Ie, the sound card has two volume
> contrrols, one affecting the recording level.
Yes, this problem is only about the monitoring level and the boost level, not
capture levels.
>>
>> Part B of problem (master volume):
>>
>> 3) The signal levels heard in the above cases, and also the level heard when
>> actually increasing the "Internal Mic" and "Microphone", is independent of the
>> "Master", "Headphone" and "Speaker" faders! I thought those were supposed to act
>> as master volumes, in other words no sound should be possible if they are
>> minimised?
>
> No. They are volume faders. not on off switches on many sound cards. Also they
> often do not control the volume of the monitoring.
When I said "no sound should be possible", I really meant "the sound level
should be inaudible", because in my experience that is what happens on
reasonable audio equipment.
And when a systen has only one output (the headphone output is the only
activated output when headphones are connected), the "Master" should control
that level (hence the name). Otherwise it is redundant, since I already have
"PCM", "Speaker" and "Headphone" faders.
As it is now, I must minimise three faders: "Master", "Internal Mic", "Internal
Mic Boost", to silence the computer. Or "Master", "Mic", "Mic Boost" if an
external mic is connected.
Surely one would expect e.g. that the "Speaker" fader should completely control
the speaker sound level? Or that the "Headphone" level should completely control
the headphones sound level? They do not do this on my system when microphone
monitoring is involved, or when the microphone boost is maximised.
Perhaps this is not how the sound card works in hardware, for some reason or
other. But on Windows 7, the mixer behaves in a way that is more in line with
traditional audio equipment. I.e. the Master fader can be used to silence the
output completely, and minimising the microphone monitoring level makes any
output of microphone signals inaudible, regardless of the microphone boost setting.
Best regards
Torquil Sørensen

On 26.07.2012 14:36, grprd wrote:
>>> Hello,
>>>
>>> I want to implement virtual driver for sound card. And sound card is not
>>> connected through standard PCI, USB.. Its connected through ethernet.
>>> Driver should detect network audio device,
>>> driver should appear to the user as any other audio output device would.
>>> UPnP protocol supported.
>>> I want to know will alsa act as virtual sound card, detect network audio
>>> device. is these featured driver already there in alsa?
>>
>> PulseAudio also fully supports this, including virtual sources/sinks and
>> uPNP as transport protocol.
>>
>>
>> Daniel
>
> Thanks for the reply. Do you have any document links, to use PulseAudio?
It is part of most Linux distributions. If it's not included in yours,
see http://www.freedesktop.org/wiki/Software/PulseAudio
Daniel

>> Hello,
>>
>> I want to implement virtual driver for sound card. And sound card is not
>> connected through standard PCI, USB.. Its connected through ethernet.
>> Driver should detect network audio device,
>> driver should appear to the user as any other audio output device would.
>> UPnP protocol supported.
>> I want to know will alsa act as virtual sound card, detect network audio
>> device. is these featured driver already there in alsa?
>
>PulseAudio also fully supports this, including virtual sources/sinks and
>uPNP as transport protocol.
>
>
>Daniel
Thanks for the reply. Do you have any document links, to use PulseAudio?
Thanks

Hello,
I want to implement virtual driver for sound card. And sound card is not connected through standard PCI, USB.. Its connected through ethernet. Driver should detect network audio device,
driver should appear to the user as any other audio output device would.
UPnP protocol supported.
I want to know will alsa act as virtual sound card, detect network audio device. is these featured driver already there in alsa?
Best Regards.

Hi,
after installing the "Windows Vista" firmware upgrade for the Rode Podcaster,
the device works flawless on Linux.
The frequency-warning does show up every second or so.
- recording does work
- playback does work
cu romal
Daniel Mack <zonque@...> hat am 25. Juli 2012 um 23:17 geschrieben:> On
22.07.2012 15:28, Robert M. Albrecht wrote:
> > Hi Dave,
> >
> > the Rode Podcaster is a microphone, optimized for recording voice for
> > podcasting.
> >
> > It has an integrated audio interface and connects via usb to the computer.
> >
> > http://www.rodemic.com/mics/podcaster
> >
> > Rode has a a Windows-Vista Fix, which actually is a firmware update for
> > the integrated audio interface.
> >
> > The firmware seems to fix some compatibility issues Without this
> > firmware update Windows XP could record, but Windows Vista could not.
> >
> > Alsa can also playback via the integrated headphone connector does also
> > work.
>
> And what about Linux? Did you try tweaking the mixer settings? As I
> said, the "cannot get freq at ep 0x82" is no hard error, just a warning,
> and it could be that it just works after if you find the right (mixer)
> settings.
>
>
> Daniel
>
>
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